Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2022 Taler Systems SA
4 :
5 : TALER is free software; you can redistribute it and/or modify it under the
6 : terms of the GNU Lesser General Public License as published by the Free Software
7 : Foundation; either version 2.1, or (at your option) any later version.
8 :
9 : TALER is distributed in the hope that it will be useful, but WITHOUT ANY
10 : WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11 : A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
12 :
13 : You should have received a copy of the GNU Lesser General Public License along with
14 : TALER; see the file COPYING.LGPL. If not, see
15 : <http://www.gnu.org/licenses/>
16 : */
17 : /**
18 : * @file merchant_api_get_otp_devices.c
19 : * @brief Implementation of the GET /otp-devices request of the merchant's HTTP API
20 : * @author Christian Grothoff
21 : */
22 : #include "platform.h"
23 : #include <curl/curl.h>
24 : #include <jansson.h>
25 : #include <microhttpd.h> /* just for HTTP status codes */
26 : #include <gnunet/gnunet_util_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include "taler_merchant_service.h"
29 : #include "merchant_api_curl_defaults.h"
30 : #include <taler/taler_json_lib.h>
31 : #include <taler/taler_signatures.h>
32 :
33 : /**
34 : * Maximum number of OTP devices we return.
35 : */
36 : #define MAX_OTP 1024
37 :
38 :
39 : /**
40 : * Handle for a GET /otp-devices operation.
41 : */
42 : struct TALER_MERCHANT_OtpDevicesGetHandle
43 : {
44 : /**
45 : * The url for this request.
46 : */
47 : char *url;
48 :
49 : /**
50 : * Handle for the request.
51 : */
52 : struct GNUNET_CURL_Job *job;
53 :
54 : /**
55 : * Function to call with the result.
56 : */
57 : TALER_MERCHANT_OtpDevicesGetCallback cb;
58 :
59 : /**
60 : * Closure for @a cb.
61 : */
62 : void *cb_cls;
63 :
64 : /**
65 : * Reference to the execution context.
66 : */
67 : struct GNUNET_CURL_Context *ctx;
68 :
69 : };
70 :
71 :
72 : /**
73 : * Parse OTP device information from @a ia.
74 : *
75 : * @param ia JSON array (or NULL!) with otp_device data
76 : * @param[in] tgr partially filled response
77 : * @param tgh operation handle
78 : * @return #GNUNET_OK on success
79 : */
80 : static enum GNUNET_GenericReturnValue
81 0 : parse_otp_devices (const json_t *ia,
82 : struct TALER_MERCHANT_OtpDevicesGetResponse *tgr,
83 : struct TALER_MERCHANT_OtpDevicesGetHandle *tgh)
84 : {
85 0 : unsigned int otp_len = (unsigned int) json_array_size (ia);
86 :
87 0 : if ( (json_array_size (ia) != (size_t) otp_len) ||
88 : (otp_len > MAX_OTP) )
89 : {
90 0 : GNUNET_break (0);
91 0 : return GNUNET_SYSERR;
92 : }
93 0 : {
94 0 : struct TALER_MERCHANT_OtpDeviceEntry otp[GNUNET_NZL (otp_len)];
95 : size_t index;
96 : json_t *value;
97 :
98 0 : json_array_foreach (ia, index, value) {
99 0 : struct TALER_MERCHANT_OtpDeviceEntry *ie = &otp[index];
100 : struct GNUNET_JSON_Specification spec[] = {
101 0 : GNUNET_JSON_spec_string ("otp_device_id",
102 : &ie->otp_device_id),
103 0 : GNUNET_JSON_spec_string ("device_description",
104 : &ie->device_description),
105 0 : GNUNET_JSON_spec_end ()
106 : };
107 :
108 0 : if (GNUNET_OK !=
109 0 : GNUNET_JSON_parse (value,
110 : spec,
111 : NULL, NULL))
112 : {
113 0 : GNUNET_break_op (0);
114 0 : return GNUNET_SYSERR;
115 : }
116 : }
117 0 : tgr->details.ok.otp_devices_length = otp_len;
118 0 : tgr->details.ok.otp_devices = otp;
119 0 : tgh->cb (tgh->cb_cls,
120 : tgr);
121 0 : tgh->cb = NULL; /* just to be sure */
122 : }
123 0 : return GNUNET_OK;
124 : }
125 :
126 :
127 : /**
128 : * Function called when we're done processing the
129 : * HTTP /otp-devices request.
130 : *
131 : * @param cls the `struct TALER_MERCHANT_OtpDevicesGetHandle`
132 : * @param response_code HTTP response code, 0 on error
133 : * @param response response body, NULL if not in JSON
134 : */
135 : static void
136 0 : handle_get_otp_devices_finished (void *cls,
137 : long response_code,
138 : const void *response)
139 : {
140 0 : struct TALER_MERCHANT_OtpDevicesGetHandle *tgh = cls;
141 0 : const json_t *json = response;
142 0 : struct TALER_MERCHANT_OtpDevicesGetResponse tgr = {
143 0 : .hr.http_status = (unsigned int) response_code,
144 : .hr.reply = json
145 : };
146 :
147 0 : tgh->job = NULL;
148 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
149 : "Got /otp-devices response with status code %u\n",
150 : (unsigned int) response_code);
151 0 : switch (response_code)
152 : {
153 0 : case MHD_HTTP_OK:
154 : {
155 : const json_t *otp_devices;
156 : struct GNUNET_JSON_Specification spec[] = {
157 0 : GNUNET_JSON_spec_array_const ("otp_devices",
158 : &otp_devices),
159 0 : GNUNET_JSON_spec_end ()
160 : };
161 :
162 0 : if (GNUNET_OK !=
163 0 : GNUNET_JSON_parse (json,
164 : spec,
165 : NULL, NULL))
166 : {
167 0 : tgr.hr.http_status = 0;
168 0 : tgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
169 0 : break;
170 : }
171 0 : if (GNUNET_OK ==
172 0 : parse_otp_devices (otp_devices,
173 : &tgr,
174 : tgh))
175 : {
176 0 : TALER_MERCHANT_otp_devices_get_cancel (tgh);
177 0 : return;
178 : }
179 0 : tgr.hr.http_status = 0;
180 0 : tgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
181 0 : break;
182 : }
183 0 : case MHD_HTTP_UNAUTHORIZED:
184 0 : tgr.hr.ec = TALER_JSON_get_error_code (json);
185 0 : tgr.hr.hint = TALER_JSON_get_error_hint (json);
186 : /* Nothing really to verify, merchant says we need to authenticate. */
187 0 : break;
188 0 : default:
189 : /* unexpected response code */
190 0 : tgr.hr.ec = TALER_JSON_get_error_code (json);
191 0 : tgr.hr.hint = TALER_JSON_get_error_hint (json);
192 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
193 : "Unexpected response code %u/%d\n",
194 : (unsigned int) response_code,
195 : (int) tgr.hr.ec);
196 0 : break;
197 : }
198 0 : tgh->cb (tgh->cb_cls,
199 : &tgr);
200 0 : TALER_MERCHANT_otp_devices_get_cancel (tgh);
201 : }
202 :
203 :
204 : struct TALER_MERCHANT_OtpDevicesGetHandle *
205 0 : TALER_MERCHANT_otp_devices_get (
206 : struct GNUNET_CURL_Context *ctx,
207 : const char *backend_url,
208 : TALER_MERCHANT_OtpDevicesGetCallback cb,
209 : void *cb_cls)
210 : {
211 : struct TALER_MERCHANT_OtpDevicesGetHandle *tgh;
212 : CURL *eh;
213 :
214 0 : tgh = GNUNET_new (struct TALER_MERCHANT_OtpDevicesGetHandle);
215 0 : tgh->ctx = ctx;
216 0 : tgh->cb = cb;
217 0 : tgh->cb_cls = cb_cls;
218 0 : tgh->url = TALER_url_join (backend_url,
219 : "private/otp-devices",
220 : NULL);
221 0 : if (NULL == tgh->url)
222 : {
223 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
224 : "Could not construct request URL.\n");
225 0 : GNUNET_free (tgh);
226 0 : return NULL;
227 : }
228 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
229 : "Requesting URL '%s'\n",
230 : tgh->url);
231 0 : eh = TALER_MERCHANT_curl_easy_get_ (tgh->url);
232 0 : tgh->job = GNUNET_CURL_job_add (ctx,
233 : eh,
234 : &handle_get_otp_devices_finished,
235 : tgh);
236 0 : return tgh;
237 : }
238 :
239 :
240 : void
241 0 : TALER_MERCHANT_otp_devices_get_cancel (
242 : struct TALER_MERCHANT_OtpDevicesGetHandle *tgh)
243 : {
244 0 : if (NULL != tgh->job)
245 0 : GNUNET_CURL_job_cancel (tgh->job);
246 0 : GNUNET_free (tgh->url);
247 0 : GNUNET_free (tgh);
248 0 : }
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